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Silfra

The clearest water on earth

Silfra, between the continents

The Geology of Silfra

Silfra is a fissure between the North American and Eurasian tectonic plates in Thingvellir National Park. The rift was formed in 1789 by the earthquakes accompanying the divergent movement of the two tectonic plates. The diving and snorkeling site at Silfra is right where the two continents meet and drift apart about 2 cm per year. Silfra is the only place in the world where you can dive or snorkel directly in a crack between two tectonic plates.

The earthquakes of 1789 opened up several fissures in the Thingvellir area, but the Silfra fissure cut into the underground spring filled with glacial meltwater from the nearby Langjökull glacier. The water is filtered through porous underground lava for 30-100 years before reaching the spring that feeds into Silfra. The water is therefore extremely pure by the time it reaches the north end of Thingvellir lake and it allows for underwater visibility of over 100 meters in Silfra. The glacial meltwater remains very cold in Silfra, but as fresh water is constantly filling the fissure, the water never freezes and remains 2°C – 4°C year round. The underwater visibility of the water in Silfra will rarely, if ever, be surpassed. Silfra is said to have the clearest water in the world; feel free to have a sip of this pristine water at any point during your dive or snorkel.

As Silfra is right at the crux between the tectontic plates, it is a very “living” dive site in that it is constantly undergoing changes, both large and small. The fissure widens incrementally, but more drastic changes to the depth profile have occurred during earthquakes in which boulders and rocks fall into the crack. This shifting of the earth creates new tunnels, caverns, and underwater terrain.
On our Diving Silfra Day Tour we offer the PADI Silfra Tectonic Specialty Course, where we dive deeper into the geology of Silfra.

The Dive between the continents

Snorkeling Silfra & Golden Circle

All the highlights in one day

Snorkeling Silfra Under The Midnight Sun

Mysterious and quiet

Sections of Silfra

The Silfra rift occupies in total a relatively small surface area, approximately 600 by 200 meters. Walking from the parking lot to Silfra will lead you past a pool of water prior to the Silfra entrance. Hidden from view is a cave that extends from this pool of water to great depths—63 meters at least. Diving in all cave and overhead environments is strictly prohibited in Silfra and the Silfra cave is an especially dangerous for diving due to its narrow passages and instability. At the other end of the pool, a tunnel links this body of water with Silfra. This tunnel is known as “the toilet” due to the strong current that flushes divers down the swim-through. Diving through this tunnel is also now prohibited.

The main part of Silfra has been divided into four main sections: Silfra Big Crack, Silfra Hall, Silfra Cathedral, and Silfra Lagoon. The first three sections are deep, expansive canyons, sometimes extending down into dark and uncharted cave systems. This series of impressively deep cracks in the earth is followed by a shallow lagoon with fields of algae. Here divers and snorkelers can see across the entire span of the lagoon, about 100 meters. We plan our dives and snorkel swims so that we are able to see all the parts of Silfra in every Diving Silfra Day Tour and Silfra Snorkeling Tour. Silfra is at some points very deep (cave systems can descend to approximately 60 meters). If you are diving, the maximum allowed depth of your dive in Silfra will be 18 meters, and the average depth of the dive is between 7 and 12 meters.

Life in Silfra

Although Thingvellir Lake has an abundance of fish species and trout fishing is very popular in the lake, the fish usually do not venture far into the Silfra fissure. The marine life in Silfra consists mostly of bright green “troll hair” and different types of algae that provide a colorscape unlike anything that occurs naturally above the surface.

Wide angle photo of a diver approaching with a shining torch from back of Silfra passage walled in by basalt rocks

An aerial photo of the meeting point at Silfra

Green moss covering the rock formation in Silfra, Thingvellir

The entry platform used to go into Silfra

Snorkelers at the Exit Platform located in the Silfra Lagoon

A rare sight of an Artic Char in Silfra, Iceland

Freediver swimming in the crystal clear water in Silfra

Green Algae often called Troll's hair found in Silfra

Group of snorkelers swimming between the continents

Drone shot of the exit platform in Silfra

Traffic sign of a diver entering a crosswalk in his dive gear

Extremely happy divers walking back from their dive in Silfra

Snorkelers snorkeling in the beautiful evening sun with the ground covered in snow

History of Diving in Silfra

Diving in Silfra began in 1966. A teacher at the Stýrimannaskóli (“Seafaring School”) in Reykjavík, Þröstur Sigtryggson, had just returned to Iceland from the United States where he had learned to dive. Þröstur advertised a beginner’s diving course and a small group of interested individuals gathered to learn this new sport. After completing their course, this group went to dive in Silfra and the surrounding fissures at Thingvallavatn. Níkúlás Halldórsson, one of these first divers, says they were drawn to Silfra for the same reasons as we are today—they thought it was beautiful and clear. All of the original divers wore wet suits, as dry suits were unheard of for recreational divers at the time.

Tómas Knútsson, the founder of DIVE.IS, first dived in Silfra in 1976. Like the original Silfra divers, Tómas used a wetsuit when diving in Iceland. He switched to a dry suit in 1989, when he started to dive year round in Silfra and elsewhere in Iceland. Silfra began to gain international recognition as a dive site through Tómas’s efforts in the 1990s and 2000s.

Location & Facilities

Silfra is located in Thingvellir National Park, about an hour’s drive from Reykjavík. Silfra is easily accessible in the park via both paved and gravel roads. The parking lot directly adjacent to Silfra is reserved for use by commercial vehicles only. A metered parking lot (P5) just down the road is available to participants on the Silfra snorkeling and diving tours. Thingvellir National Park has an Information Center at the junction between road 36 (the main road from Reykjavík) and road 361 (the road turning into the park). The Information Center has a café, shop, and restrooms. Outdoor toilets are also available at Silfra.

The entrance to Silfra is about a 100 meter walk from the Silfra parking lot. Snorkelers and divers enter Silfra by descending a metal staircase, which ends in a submerged platform. The submerged platform allows for divers to do their final buddy checks and for snorkelers to adjust to how the dry suit changes when immersed in a water environment. A metal exit platform at the end of Silfra in the Lagoon provides an easy exit procedure for divers and snorkelers, as well as protecting the fragile terrain from disturbance. Exiting Silfra at points other than the entry and exit platforms is not allowed, except in the case of an emergency. The walk back to the parking lot from the exit platform is about 400 meters.

Thingvellir National Park

Thingvellir National Park has been declared a UNESCO WORLD HERITAGE SITE both for its cultural and historical significance as well as natural and geological uniqueness. The park surrounds part of Iceland’s largest lake, Thingvallavatn. The area lies directly on the mid-Atlantic ridge, where the North American and Eurasian tectonic plates are slowly diverging. Continental drift created fissures that are now submerged, such as Silfra and the nearby Davíðsgjá, as well as enormous rifts and canyons above water.

From 930 AD until 1798, Thingvellir was the assembly site for the national parliament of Iceland, the Althing, from which Thingvellir derives its name. The assembly was a forum to recite the laws and make amendments, to resolve conflicts and feuds, and to make trade and marriage arrangements. It is thought that speakers at the assembly made use of the acoustics of canyon walls to help their voice carry further.

If you have friends or family accompanying you on your tour who do not wish to get into the water themselves, the area around Silfra is full of lovely walking trails that lead through this fascinating place. Our Golden Circle Day Tour combines snorkeling or diving with an on land exploration of the Thingvellir area as well as the other sites along the Golden Circle.

Video about Silfra

A Silfra dive in moving images, text and music

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Rules and regulations

As Silfra is located in Thingvellir National Park, the snorkeling and diving activities are subject to rules and regulations set by the national park authorities. The national park authorities stipulate that

all divers must have at minimum Open Water diving certification from an internationally recognized diving organization. Open Water certification means that a diver is certified to dive to 18 meters without the direct supervision of an instructor.

all divers in Silfra must be certified in dry suit diving by an internationally recognized diving organization. In lieu of this, divers may present proof of a minimum of 10 logged dry suit dives within 2 years of the planned dive at Silfra. These logged dry suit dives must be signed off by an instructor from an internationally recognized diving organization.

Address

Frequently asked questions about Silfra

Yes, there are toilet facilities at Silfra. However we kindly ask you to not use them for changing, as there are only 2 toilets at Silfra and it can cause long queues to form. We do have a changing room vehicle, and often several other cars at Silfra for participants to change clothes in. Due to this layout, we highly recommend that participants arrive at Silfra already wearing their thermal base layer.

The Þingvellir National Park charges a parking fee (750,- ISK for a passenger car ), which allows you to park in any of the five car parks in the park for the duration of the day. Please note that the parking lot for divers and snorkelers at Silfra is called P5 and is about a 5 minute walk to the Silfra meeting point.
You can pay for parking online at www.myparking.is before or during the day of visit, and enter the license plate of your car into the system. Cameras check all license plates entering and leaving the parking lots. If you can’t pay online , you can pay at the Visitor centre. Pay machines will also be installed at the parking lots in near future. The pay machines accept all major credit/debit cards.

Although there is plenty of life in Silfra, most of it is either plant life or microinvertibrates, which are not visible with the human eye. Silfra is home to a unique amphipod called Crymostygius Thingvallensis found only in Thingvellir Lake and the surrounding fissures, such as Silfra. With regards to fish life, there are three different species of fish that live in the lake: Brown Trout, Arctic Char and Sticklebacks, however, only the Arctic Char visit the fissure; they are frequent visitors during mating season in August and September. Throughout the rest of the year, the only fish who live in the Silfra fissure are the Dwarf Char, a subspecies of the Arctic Char. These range in size from a few centimetres, to approximately 10cm maximum, and live down in the darker recesses near the rocks and as such are not often spotted by divers or snorkelers.

The maximum allowed dive depth in Silfra is 18 meters / 60 feet, however the average depth of a typical Silfra dive is about 10 meters / 32 feet. Depending on the dive qualifications and dive experience of the divers, the Silfra dive might be shallower for safety and convenience.

It is about 60 km from Reykjavik to Silfra and it takes a little less than one hour to drive the distance by car, given the weather conditions are good. If you choose to drive to Silfra yourself and don‘t know the way, we recommend you to study the map before you hit the road. Silfra is located in Þingvellir National Park, which is a bit different from other national parks. At a point, when you turn into road 36, you will feel like you are driving into the middle of nowhere. Please do not turn around, just keep going straight until you see our company cars which are parked at the Silfra Meeting Point, you then drive a little further to parking lot P5 to park. If at anytime you feel lost please do not hesitate to call our office for help.

Silfra is located in Thingvellir National Park, one of the main sites of the Golden Circle. It is a stunningly beautiful area as well as being one of Iceland's most important historical sites. There are many walking trails around the park and close by Silfra, and many of the areas have information signs telling you about the historical & geological aspects of the area around Silfra and Thingvellir.

There is no best or worst time to dive Silfra. Every season and every weather has its advantages. A calm and overcast winter day will be amazing with beautiful reflections in Silfra´s water surface. A windy summer day with waves will cast sun ripples onto the Silfra bottom... a sight you will never forget. Generally in the summer there are more snorkelers & divers at Silfra, so the winters are calmer, but winter surface conditions can also be more challenging in regards to weather and cold.

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